Floribunda rose plant named ‘KORrosobi’

ABSTRACT

A new and distinct variety of Floribunda Rose Plant, herein referred to by its cultivar name, ‘KORrosobi’, is provided which forms in abundance on a substantially continuous basis attractive, orange colored blossoms. The vegetation is vigorous and the growth habit is very bushy and compact. Attractive ornamental glossy, dark green foliage is formed. The new variety is particularly well suited for providing distinctive ornamentation in the landscape.

Botanical/commercial classification:

Latin name—Rosa hybrida.

Common name—Floribunda Rose Plant.

Varietal denomination—‘KORrosobi’.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Plant Breeders' Right ApplicationNumber 2017/2305, which was filed at Community Plant Variety Office inthe European Union on Sep. 20, 2017, the contents of which are herebyincorporated by reference for all purposes.

SUMMARY OF THE INVENTION

The new variety of Rosa hybrida Floribunda Rose Plant of the presentinvention was created during May 2007 at Offenseth-Sparrieshoop, Germanyby artificial pollination wherein two parents were crossed whichpreviously had been studied in the hope that they would contribute thedesired characteristics. The female parent (i.e., seed parent) of thenew variety was the ‘KORamflusa’ variety (U.S. Plant Pat. No. 24,406).The male parent (i.e., pollen parent) of the new variety was the‘NOA75800’ variety (non-patented in the United States).

The parentage can be summarized as follows:‘KORamflusa’ x ‘NOA75800’

The seeds resulting from the above pollination were sown and smallplants were obtained which were physically and biologically differentfrom each other. Selective study resulted in the identification of asingle plant of the new variety.

It was found that the new Floribunda Rose Plant of the present inventionpossesses the following combination of characteristics:

-   -   (a) abundantly and substantially continuously forms attractive,        orange colored blossoms,    -   (b) exhibits a very bushy and compact growth habit,    -   (c) forms vigorous vegetation, and    -   (d) forms attractive ornamental glossy, dark green foliage.

The new variety well meets the needs of the horticultural industry. Itcan be grown to advantage as ornamentation in parks, gardens, publicareas, and in residential settings. Accordingly, the plant isparticularly well suited for growing in the landscape.

The new variety can be readily distinguished from its ancestors. Morespecifically, the ‘KORamflusa’ variety (i.e., seed parent) exhibitslarger flowers and a less compact growth habit compared to the newvariety and displays yellow flowers with pink edges, whereas the newvariety displays orange colored flowers. Additionally, the ‘NOA75800’variety (i.e., pollen parent) exhibits a lower petal count, more diseaseresistance, and a different flower color compared to the new variety.Moreover, the new variety can be readily distinguished from non-parentalrelated similar varieties. For example, the ‘Poulpa1068’ variety (U.S.Plant Pat. No. 28,930) displays less petals and is taller and widercompared to the new variety.

The new variety has been found to undergo asexual propagation in KleinOffenseth-Sparrieshoop, Germany by a number of routes such as budding.Asexual propagation techniques in Germany, such as budding, have shownthat the characteristics of the new variety are homogeneous, stable, andstrictly transmissible by such asexual propagation from one generationto another. Accordingly, the new variety undergoes asexual propagationin a true-to-type manner.

The new variety has been named ‘KORrosobi’.

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The accompanying photograph shows, as nearly true as it is reasonablypossible to make the same in color illustrations of this character, atypical specimen of the new variety. The illustrated rose plant of thenew variety was approximately three years of age and was observed atBaden-Baden, Germany while growing outdoors on understock in June 2017.

FIG. 1—illustrates a specimen of a plant displaying floral buds andflowers at varying points of opening.

FIG. 2—illustrates a specimen of the foliage—close up view of leaflets.

DETAILED BOTANICAL DESCRIPTION

The chart used in the identification of colors is that of The RoyalHorticultural Society (R.H.S. Colour Chart, 2015 edition). Theterminology which precedes reference to the chart has been added toindicate the corresponding color in more common terms. The descriptionis based on the observation of a three-year-old specimen of the newvariety, observed during June, while growing in a field on its own rootsat Cochranville, Pa.

-   Class: Floribunda Rose Plant.-   Plant:    -   -   Habit.—Very bush and compact.        -   Height.—Approximately 45.0 cm on average.        -   Width.—Approximately 45.0 cm on average.-   Branches:    -   -   Stem color.—Old wood: commonly a blend of commonly near            Yellow-Green Group 146B and Greyed-Purple Group 183B. Young            stems: commonly near Greyed-Purple Group 183C.        -   Main stem size.—Length is approximately 45.0 cm on average            and diameter is approximately 6.0 mm on average.        -   Secondary stem length.—Length is approximately 8.0-10.0 cm            on average and diameter is approximately 3.0 mm on average.        -   Thorns.—Young thorns: length is approximately 5.0 mm on            average, width is approximately 3.0 mm at point of            attachment on average, and color is commonly near            Greyed-Purple Group 183D. Old thorns: length is            approximately 1.0 cm on average, width is approximately 8.0            mm at point of attachment on average, and color is commonly            near Greyed-Purple Group 183C.-   Foliage:    -   -   General appearance.—Ornamental glossy and dark green            colored.        -   Young foliage.—Upper surface color: commonly near            Yellow-Green Group 146A with near Greyed-Purple Group 183B            along the margins and venation of near Greyed-Purple Group            183A. Under surface color: commonly near Yellow-Green Group            146B with some blending of near Greyed-Orange Group 176B            toward the margins and venation of near Yellow-Green Group            146C.        -   Old foliage.—Upper surface color: commonly near Green Group            NN137A with venation of near Green Group NN137B. Under            surface color: commonly near Green Group 137B with venation            of near Green Group 137C.        -   Petiole.—Upper surface: texture is smooth; color is commonly            a blend of near Green Group 137B and Greyed-Purple Group            183A. Under surface: texture is smooth with a few thorns            measuring approximately 2.0 mm in length, color is commonly            near Green Group 137C. Length: approximately 3.5 cm on            average.        -   Rachis.—Color: upper surface is commonly a blend of near            Green Group 137B and Greyed-Purple Group 183A, under surface            is commonly near Green Group 137C. Size: length is            approximately 7.5 cm on average.        -   Stipules.—Length: approximately 2.0 cm on average. Width:            approximately 6.0 mm on average. Margin: entire to erose.            Color upper and under surfaces: commonly near Green Group            137C with some blending of near 185C.        -   Leaf margin.—Serrate.        -   Glossiness of upper side of leaf.—Very glossy.-   Leaflets:    -   -   Number.—3, 5, and 7.        -   Shape.—Ovate.        -   Venation pattern.—Reticulate.        -   Texture.—Upper surface is smooth; under surface is smooth.        -   Terminal leaflet.—Length is approximately 5.0 cm on average;            width is approximately 3.3 cm on average; apex is acute,            base is rounded, and margin undulation is moderate.        -   Lower leaflets.—Length is approximately 3.5 cm on average            and width is approximately 2.5 cm on average.        -   5-leaflet leaf.—Length is approximately 12.0 cm on average            and width is approximately 8.0 cm on average.-   Inflorescence:    -   -   Number of bloossoms per stem or in a cluster.—Typically up            to 13 per stem.        -   Peduncle.—Color: commonly Yellow-Green Group 144A blended            with near 199A. Diameter: approximately 3.0 mm on average.            Length: approximately 4.7 cm on average. Surface texture:            sparely covered in short, flexible thorns that measure less            than 1.0 mm in length.        -   Sepals.—Number: commonly 5. Upper surface color and texture:            covered in short pubescence and color is commonly near            Yellow-Green Group 144A. Under surface color and texture:            puberulent and color is commonly near Yellow-Green Group            144A blended with near Greyed-Purple Group 183C. Size:            length is approximately 2.5 cm on average and width is            approximately 1.0 cm on average. Margin: entire with            occasional extensions on two or three sepals measuring            approximately 5.0 mm to 1.0 cm in length and approximately            5.0 mm in width.        -   Bud.—Shape: rounded to ovoid. Size: length is approximately            2.0 cm on average; width is approximately 2.0 cm on average.            Color (when opening): commonly near Orange-Red Group 31B            blended with Yellow-Orange Group 16A.        -   Flower.—Form: double, traditional. Profile: flat to slightly            concave. Depth: approximately 3.5 cm on average. Diameter:            approximately 7.5 cm on average.        -   Fragrance.—Very light fragrance.        -   Petal.—Number: approximately 55 on average. Drop: good.            Length: approximately 3.5 cm on average. Width:            approximately 3.5 cm on average. Shape: overall shape is            broadly obovate; apex is rounded; and base is rounded to            cuneate. Margin: entire. Color with first and fully open:            upper surface is commonly near Orange-Red Group 31B with            basal spot of commonly near Yellow Group 11A; and under            surface is commonly near Orange Group 26C with basal spot of            commonly near Yellow Group 11D. Color when fading: upper            surface is commonly near Orange-Red Group 31C with some of            the outermost petals exhibiting tones near Red Group 44B            near the apical margin and basal spot of near Yellow Group            11B; under surface is commonly near Orange-Red Group 31D            with some of the outermost petals exhibiting tones near Red            Group 44B near the apical margin and basal spot of near            Yellow Group 11B.        -   Petaloids.—Number: approximately 6 on average.        -   Stamen.—Number: approximately 60 on average. Anthers: number            is about 60 and color is commonly near is commonly near            Yellow-Orange Group 21B. Filaments: length is approximately            5.0 mm on average and color is commonly near Yellow-Orange            Group 17C.        -   Pistils.—Arrangement separate and free. Number:            approximately 75. Style: color is commonly near Yellow Group            4C; length is approximately 4.5 mm on average. Stigma: color            is commonly near Yellow Group 6C; diameter is commonly less            than 1.0 mm on average.        -   Receptacle.—Achenes stand on the bottom and wall; diameter            is approximately 1.0 cm on average, shape is urn shaped to            round, color is commonly near Yellow-Green Group 144A, and            surface texture is smooth.        -   Pollen.—Sparse; color is closest to Orange Group 24B.        -   Hips/seed.—None observed.-   Development:    -   -   Vegetation.—Dark green, glossy, vigorous and strong.        -   Blooming.—Abundant and substantially continuous from spring            through frost.        -   Hardiness.—Hardy to USDA Zone 6b.        -   Resistance to disease.—Very good resistance for mildew.

Plants of the ‘KORrosobi’ variety have not been observed under allpossible environmental conditions to date. Accordingly, it is possiblethat the phenotypic expression may vary somewhat with changes in lightintensity and duration, cultural practices, and other environmentalconditions.

I claim:
 1. A new and distinct Floribunda Rose Plant characterized bythe following combination of characteristics: (a) abundantly andsubstantially continuously forms attractive, orange colored blossoms,(b) exhibits a very bushy and compact growth habit, (c) forms vigorousvegetation, and (d) forms attractive ornamental glossy, dark greenfoliage; substantially as herein shown and described.